KR910008409B1 - Transducer manufacturing method in ultrasonic cleaning device - Google Patents

Abstract

The transducer continuously radiates strong ultrasound wave within the cleaner, so the heat stability of the vibrator and the errosion- resistance of the metal block are bettered. The manufacturing method comprises i) putting a ring (2) on a top plate (1) and inserting a carrier (3) into the ring, for preventing workpieces (metal block, piezoelectric ceramics) from shaking in lapping, ii) lapping are end of each of the workpieces by rotatting the top plate after spreading water and lapping agent, iii) lapping the other ends of the workpieces by turning the workpieces upside down, and iv) equalizing the roughness of both ends by repeating the processes ii), iii).

Description

Piezoelectric Zhuban Transducer for Ultrasonic Cleaner

Figure 1a is an exploded perspective view of a conventional piezoelectric juban type transducer.

Figure 1b is a state diagram of the conventional piezoelectric transducer type transducer.

2 is a surface roughness comparison display diagram of a conventional piezoelectric juban type transducer.

Figure 3a is an exploded perspective view of a piezoelectric transducer type transducer according to the present invention.

Figure 3b is a coupling state of the piezoelectric transducer type transducer according to the present invention.

4 is a plan view of the lapping process according to the present invention.

5 is a front view of the lapping process according to the present invention.

6 is a surface roughness comparison diagram of the piezoelectric Jojuban transducer according to the present invention.

* Explanation of symbols for main parts of the drawings

1a: Ultrasonic Radiating Metal 1b: Ultrasonic Reflective Metal

1c, 1c ': piezoceramic vibrator 1d, 1d': electrode plate

1e: Bolt 1f: Vaginal Bushing

1g: Nut 1: platen

2: ring 3: carrier

4: 4 processed material 5: weight ring

6: abrasive

The present invention relates to a pressure strategy juban type transducer used in an ultrasonic cleaner, and in particular, the ultrasonic vibration energy of the vibrator is continuously radiated with strong ultrasonic waves in the liquid of the cleaner, so that the thermal stability of the vibrator and the metal block (ultrasonic radiating metal, ultrasonic reflecting metal). It has good corrosion resistance on the surface of) and prevents slippage due to friction of metal block and piezoceramic vibrator and breakage of piezoceramic vibrator, improves electrical and mechanical properties, and improves ultrasonic vibration transmission and cleaning effect. It relates to a piezoelectric Jojuban transducer manufacturing method of the ultrasonic cleaner.

The pressure strategy juban type transducer used in the conventional ultrasonic cleaner is a metal block (top surface, bottom surface 1a1 'of the ultrasonic radiating metal 1a, and top surface, bottom surface 1b of the ultrasonic reflective metal 1b as shown in FIGS. 1a and b). ') And the bottom surface (1g') of the nut (1g) are made by cutting only to the desired shape specification in the raw material state, and then fixing and fixing the bolt (1e) to the ultrasonic radiating metal (1a) by inserting the insulating bushing (1f). Then, the electrode plate 1d, the piezoelectric ceramic vibrator 1c, the electrode plate 1d ', and the piezoelectric ceramic vibrator 1c' were sequentially connected with the ultrasonic reflecting metal 1b, and then the bolt 1e and the nut 1g were connected. There is a technique of applying an adhesive to the fastener, and also after fixing the bolt (1e) to the ultrasonic radiating metal (1a), and inserting the insulating bushing (1f) and then sequentially the electrode plate (1d) and the piezoceramic vibrator ( 1c), the electrode plate 1d ', and the piezoelectric ceramic 1c' are connected to each other, and then an adhesive is applied to the bolt 1e to make the supersonic reflective metal 1b. The configuration is completed by tightening the.

As described above, in a piezoelectric vacuum pump type transducer composed of a conventional vibrator, when a vibrator is assembled to a washing machine and a high frequency electric input signal is applied to the electrode plate 1d and the electrode plate 1d ', the piezoelectric ceramic vibrator 1c and the piezoelectric member The ceramic vibrator 1c 'vibrates at the same period as the input signal, and the vibration energy is propagated to the actual load side through the ultrasonic radiation metal 1a, and the vibration energy is blocked through the ultrasonic reflection metal 1b.

At this time, the piezoelectric ceramic vibrators 1c and 1c 'are subjected to a lapping process to obtain surface roughness and a plan view, and the assembly is performed. As shown in FIG. 1 and FIG. (1a), the surfaces 1a'1b ') of the ultrasonic reflective metal 1b) are cut and processed (), so that the surfaces of the ultrasonically reflective metal 1a and the ultrasonic reflective metal 1b are assembled. (1a ', 1b') has a rough cutting process, which causes breakage of the piezoelectric ceramic vibrator during assembly and generates high heat in the entire vibrator between the gaps, thereby greatly reducing vibration transmission efficiency and cleaning effect.

That is, in the conventional piezoelectric coupling type transducer as described above, in order to obtain uniform surface roughness and plane of both surfaces of the piezoelectric ceramic vibrator, assembly is performed by using silver paste and polishing lapping on both surfaces. (Ultrasonic Radiating Metal, Ultrasonic Reflective Metal, Nut, etc.) are processed through cutting process and short-bristling process, that is, the surface roughness between the medium and the medium is not uniform, and the piezoceramic vibrator is damaged when assembly. Gap and surface roughness between the piezoelectric ceramic vibrator and the metal block cause high heat to the entire transducer between the gaps.The electrical and mechanical properties of the vibrator are deteriorated, and the safety ceramics when torque tightening are assembled. Slip on vibrators 1c and 1c 'and metal blocks (ultrasonic radiating metals, ultrasonic reflecting metals, electrode plates 1d and 1d') The friction and the eccentricity is generated in the vibrator blossomed center there is a problem that significantly decreases the ultrasonic vibration transmission efficiency and washing effect.

The present invention is to solve such a problem as described in detail with reference to the accompanying drawings as follows.

The present invention cuts the metal block (top surface of the ultrasonic radiation metal 1a, top surface 1a 'and top surface of the ultrasonic reflective metal 1b, bottom surface 1b') as shown in FIGS. 3a and b. Foreign matter between the media (surface roughness, burr, plane) is subjected to lapping using high-purity molten-purified micro alumina polishing agent to precisely surface roughness (0.5 μm) of the medium.

That is, according to the present invention, the bolt 1e is connected and fixed to the ultrasonic radiating metal 1a having a smooth surface, and then the insulating bushing 1f is inserted into the piezoelectric ceramic vibrators 1c and 1c '. After connecting the ultrasonic reflective metal 1b, which is connected between the plate 1d and the electrode plate 1d ', and both surfaces have been lapping, only the end face 1g' of the nut 1g is subjected to lapping. The torque is assembled and assembled.

Herein, the lapping process will be described in detail with reference to the plan view of FIG. 4 and the front view of FIG. 5. The carrier 3 is mounted on the plate 1 and the carrier 3 is mounted in the ring 2. The reason for mounting in the ring 2 is to remove the shaking of the workpiece (metal block or piezoelectric ceramic) 4 during lapping and to stably process the workpiece.

After mounting the carrier 3 in the ring 2, the weight ring 5 was placed on the workpiece 4, and the abrasive 6 (water: abrasive mixed with 300 to 500 ml and 30 to 50 g of abrasive) When sprinkled on the surface plate 1, the surface plate 1 is rotated while the abrasive 6 penetrates between the surface spaces of the workpiece 4, and processing is performed.

To obtain the surface roughness of the primary workpiece, first perform the first end face machining of the workpiece 4 as shown in FIG. 5, and then turn the workpiece 4 again, perform the secondary cross-section machining, and turn it upside down to finish the final machining. Degrees and planar roughness can be obtained.

To put it again, the ring 2 is placed on the surface plate 1, the workpiece flow preventing carrier 3 is inserted into the ring 2, and the workpiece 4 is inserted into the through hole of the carrier 3. With the weight ring (5) on it, the surface plate (1) is rotated using the abrasive (6) mixed with water and abrasives to perform the first end surface processing, and the surface plate (1) is stopped after the first end surface processing. Turn the workpiece (4) in the through hole of the carrier (3) upside down and stop the surface plate (1) again for secondary cross-section processing, then turn the workpiece (4) over again and finish the final processing to match the parallelism and the squareness of both sides. Be sure to

After lapping the metal block (ultrasonic radiating metal (1a) and ultrasonic reflecting metal (1g '), which is processed in the same way as above, a flat (surface roughness) and a surface roughness of 0.5 µm are obtained, and then the surface (double-sided) lapping is performed. Adhesion and thermal stability of the deposited surface of the site (top surface of ultrasonic radiating metal 1a, bottom surface 1a ', top surface of ultrasonic reflective metal 1b, bottom surface 1b', bottom surface 1g 'of nut 1g) Heat treatment and then the bolts 1e are connected and the insulating bushing 1f electrode plate 1d piezoelectric ceramic vibrator 1c electrode plate 1d 'piezoelectric ceramic vibrator 1c' ultrasonic reflecting metal 1b ) Is sequentially assembled and applied to the electrode plate 1d and the electrode plate 1d 'to apply a high frequency electric input signal. The piezoelectric ceramic vibrators 1c and 1c' vibrate at the same period as the input signal, and the vibration energy is It propagates to the actual load side through the ultrasonic reflective metal 1a and relatively passes through the ultrasonic reflective metal 1b. Dynamic energy is cut off.

At this time, the piezoelectric ceramic is free from other foreign matter (surface roughness, burr, plane) and gap between the medium and the medium of the upper surface 1a 'of the ultrasonic radiating metal 1a and the lower surface 1b' of the ultrasonic reflecting metal 1b. It prevents damage of the vibrator and precisely stabilizes the surface roughness between the medium and the medium, thereby greatly improving the vibration transmission efficiency and the cleaning effect.

Accordingly, the present invention prevents breakage of the metal block and piezoelectric ceramic vibrator by assembling the surface roughness (0.5 μm) precisely and smoothly as shown in the comparison table of the surface roughness of FIGS. 3a, b and 6, and between the medium and the medium (metal block). Surface roughness of piezoceramic vibrator is precisely stabilized to prevent slippage during assembly and improve thermal stability and electrical and mechanical properties of ultrasonic vibrator even if strong ultrasonic wave is continuously generated by continuous ultrasonic energy. And it has the effect of greatly improving the vibration transmission efficiency and cleaning effect.

Claims (2)

In the piezoelectric flat plate type transducer of an ultrasonic cleaner, a ring (2) is placed on a surface plate (1), a workpiece flow preventing carrier (3) is inserted into the ring (2), and the workpiece (4) is formed through the hole of the carrier (3). After putting the weight ring (5) on the workpiece (4), rotate the surface plate (1) using the abrasive (6) mixed with water and abrasives, and perform the first end face processing, and after the first end face machining Stop the surface plate 1, turn over the workpiece 4 in the through hole of the carrier 3, rotate the surface plate 1 again to perform secondary cross-section processing, turn the workpiece 4 upside down and finish the final processing. Method for producing a piezoelectric Jojuban transducer of the ultrasonic cleaner characterized in that the parallelism and the squareness and the surface roughness to match. The method for producing a piezoelectric vacuum-type transducer of an ultrasonic cleaner according to claim 1, which is processed by using an abrasive mixed with 35 to 50 g of abrasive and 300 to 500 ml of water.

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